Wen-Hsi Cheng is a professor at the Department of Occupational Safety and Hygiene, Fooyin University, Kaohsiung City, Taiwan.


In our laboratory, we have packed needle trap samplers (NTS) by ourselves for extracting indoor volatile organic compounds. This investigation compared the extraction efficiency of NTS with that of the commercial 100 μm polydimethylsiloxane-solid phase microextration (PDMS-SPME) fiber sampler when applied to sample heating products from tee tree essential oil. The experimental results indicated that NTS performed better effectiveness than those of SPME fiber sampler, and the NTS, packed with 80–100 mesh divinylbenzene (DVB) particles, primarily adsorbed 5.7 ng ethylbenzene, 5.8 ng m/p-xylenes, 11.1 ng 1,2,3-trimethylbenzene, 12.4 ng 1,2,4-trimethylbenzene and 9.99 ng 1,4-diethylbenzene when thermal ceramic wicks were used to evaporate the tee tree essential oil during 1-hr evaporation period.

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